package com.sky.service.impl;

import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import org.springframework.beans.BeanUtils;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
     @Autowired
     private SetmealMapper setmealMapper;

    /**
     * 新增购物车
     * @param shoppingCartDTO
     */
     @Override
     public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
         //判断加入到购物车的商品是否已经存在
         ShoppingCart shoppingCart = new ShoppingCart();
         BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
         Long userId = BaseContext.getCurrentId();
         shoppingCart.setUserId(userId);
         List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
         //如果存在，数量加一
         if(list!=null&&list.size()>0){
             ShoppingCart cart = list.get(0);
             cart.setNumber(cart.getNumber()+1);
             shoppingCartMapper.updateNumberById(cart);
         }else{
             //如果不存在，新增

             //判断本次添加到购物车的是菜品还是套餐
             Long dishId=shoppingCartDTO.getDishId();
             if(dishId!=null){
                 //如果是菜品，设置dishId
                 Dish dish = dishMapper.getById(dishId);
                 if (dish == null) {
                     throw new RuntimeException("菜品不存在，请检查dishId是否正确");
                 }
                 shoppingCart.setName(dish.getName());
                 shoppingCart.setImage(dish.getImage());
                 shoppingCart.setAmount(dish.getPrice());

             }else {
                 //如果是套餐，设置setmealId
                 Long setmealId=shoppingCartDTO.getSetmealId();

                 Setmeal setmeal = setmealMapper.getById(setmealId);
                 if (setmeal == null) {
                     throw new RuntimeException("套餐不存在，请检查setmealId是否正确");
                 }
                 shoppingCart.setName(setmeal.getName());
                 shoppingCart.setImage(setmeal.getImage());
                 shoppingCart.setAmount(setmeal.getPrice());

             }
             shoppingCart.setNumber(1);
             shoppingCart.setCreateTime(LocalDateTime.now());
             shoppingCartMapper.insert(shoppingCart);

         }
     }
     /**
      * 查看购物车
      * @return
      */
     @Override
     public List<ShoppingCart> showShoppingCart() {
         Long userId = BaseContext.getCurrentId();
         ShoppingCart shoppingCart = ShoppingCart.builder()
                 .userId(userId)
                 .build();
         List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
         return list;
     }

     /**
      * 清空购物车
      */
     @Override
     public void cleanShoppingCart() {
         Long userId = BaseContext.getCurrentId();
         shoppingCartMapper.deleteByUserId(userId);
     }
    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}